Inverted only compound containing unsaturated alcohol (4)

I believe the answer is:

enol

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'compound containing unsaturated alcohol' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'inverted only' is the wordplay.
'inverted' is a reversal indicator.
'only' becomes 'lone' (synonyms).
'lone' back-to-front is 'ENOL'.

Can you help me to learn more?

(Another definition for enol that I've seen is " chemical".)

I've seen this clue in The Independent.

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